<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			#box{
				/* border-width:0 0 60px 0;
				border-bottom-color:red; */
				border:solid 2px black;
				padding:30px;
				text-align: center;
				line-height: 600px;
				margin: 30px;
				width: 600px;
				height: 600px;
				background-color:green;
			}
		</style>
	</head>
	<body>
		<div id="box">
			这是一个box
		</div>
	</body>
</html>
